Matsunaga's (Nakajima Kento) birthday is coming, and the shared house is planning to celebrate his birthday without telling him.

Miji (Hikaru Takahashi) heard that the protagonist of the party will receive gifts from the tenants. Considering the previous reward, she also wanted to give Matsunaga some gifts, but because Valentine's Day is coming soon, the budget is not enough.

At this time, Ling (Fujiwara Daisuke), who worked in the neighboring coffee shop, invited Meiji to work part-time because the store was short of manpower.But telling Matsunaga would definitely lead to opposition, Meiji still refused to give up and decided to work part-time without telling Matsunaga.

However, a few days after starting work, Matsunaga suddenly came to the store with his editor Saegae.Meiji fell into a crisis, but thanks to the wit of Ling, the only one who knew the situation, she finally got through the crisis.But as everyone knows, Matsunaga has already noticed Meiji working in the store.

He clearly said that in order to take the mock exam, he would go to the library to study with his friends after school and on weekends. Why? Matsunaga was deeply shocked by the fact that he lied to Meiji, and Meiji and Ling might be dating, which made him even more anxious.Kentaro (Mukai Koji) couldn't stand his excessive interference, and told him that "guarding is also the duty of the protector".Then back to the shared house, where there are suspicious figures watching the house...